Abstract: In the investigation of fire involving olaquindox, it's usually difficult to determine the fire cause, because of the lack of basic knowledge of this substance. In this study, ignition ability of different ignition sources for olaquindox was found out by experiments. The combustion phenomenon of olaquindox and the macroscopic characteristics of combustion residues were studied by image analysis. The combustion characteristics of olaquindox were analyzed by cone calorimetry. The physical and chemical properties of olaquindox were studied by thermal analysis technology. The result shows that olaquindox has high fire risk; It can be ignited by common ignition; Its maximum heat release rate cam reach 1 161.3 kW/m2, maximum effective combustion heat can reach 74.84 MJ/kg, and the fire risk is high; The ignition point of olaquindox is approximately around 210 ℃, and the combustion reaction does not need oxygen. This study is helpful for the investigation of fire caused by olaquindox.

Key words: fire investigation, olaquindox, combustion characteristic